Common Stock - Summary of Stock Option Transactions (Parenthetical) (Detail)	12 Months Ended
Dec. 31, 2015 $ / shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Option price	$ 16.30

Share based compensation shares authorized under stock option plans exercise price.

No definition available.

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Namespace Prefix:	te_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration